US20070297707A1 - Cage for Roller Bearing and Manufacturing Method Thereof - Google Patents
Cage for Roller Bearing and Manufacturing Method Thereof Download PDFInfo
- Publication number
- US20070297707A1 US20070297707A1 US11/666,982 US66698205A US2007297707A1 US 20070297707 A1 US20070297707 A1 US 20070297707A1 US 66698205 A US66698205 A US 66698205A US 2007297707 A1 US2007297707 A1 US 2007297707A1
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- United States
- Prior art keywords
- cage
- portions
- roller
- bent
- Prior art date
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/30—Parts of ball or roller bearings
- F16C33/46—Cages for rollers or needles
- F16C33/54—Cages for rollers or needles made from wire, strips, or sheet metal
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/30—Parts of ball or roller bearings
- F16C33/46—Cages for rollers or needles
- F16C33/54—Cages for rollers or needles made from wire, strips, or sheet metal
- F16C33/542—Cages for rollers or needles made from wire, strips, or sheet metal made from sheet metal
- F16C33/543—Cages for rollers or needles made from wire, strips, or sheet metal made from sheet metal from a single part
- F16C33/546—Cages for rollers or needles made from wire, strips, or sheet metal made from sheet metal from a single part with a M- or W-shaped cross section
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D53/00—Making other particular articles
- B21D53/10—Making other particular articles parts of bearings; sleeves; valve seats or the like
- B21D53/12—Making other particular articles parts of bearings; sleeves; valve seats or the like cages for bearings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C19/00—Bearings with rolling contact, for exclusively rotary movement
- F16C19/22—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings
- F16C19/30—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for axial load mainly
- F16C19/305—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for axial load mainly consisting of rollers held in a cage
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/30—Parts of ball or roller bearings
- F16C33/46—Cages for rollers or needles
- F16C33/467—Details of individual pockets, e.g. shape or roller retaining means
- F16C33/4676—Details of individual pockets, e.g. shape or roller retaining means of the stays separating adjacent cage pockets, e.g. guide means for the bearing-surface of the rollers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/30—Parts of ball or roller bearings
- F16C33/46—Cages for rollers or needles
- F16C33/54—Cages for rollers or needles made from wire, strips, or sheet metal
- F16C33/541—Details of individual pockets, e.g. shape or roller retaining means
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49636—Process for making bearing or component thereof
- Y10T29/49643—Rotary bearing
- Y10T29/49679—Anti-friction bearing or component thereof
- Y10T29/49691—Cage making
Definitions
- the present invention relates to a cage for a needle roller bearing and a cylindrical roller bearing, and a manufacturing method thereof.
- FIG. 12 shows the cross-sectional shape of one of both pillar portions 101 which face each other in a circumferential direction in a pocket 101 .
- the shape of the other pillar portion is also the same.
- Each pillar portion 101 has a plurality of bent portions 102 to 104 which are alternately bent in the width direction of the cage to hold the diameter (the diameter of a pitch circle of the roller, hereinafter referred to as “roller PCD”) of a circle line connecting centers of the roller in the thickness direction of the cage.
- the bent portions 102 to 104 are respectively provided with roller stopping portions 105 to 107 protruding in the shape of a claw or a tongue piece into the pocket 101 .
- a roller 108 is retained within the pocket 101 by the roller stopping portions 105 to 107 (refer to Patent Literatures 1 and 2).
- Patent Document 1 JP-UM-A-64-55322
- Patent Document 2 JP-UM-A-03-51225
- the object to be achieved by the present invention is to enable a cage to be further shortened in a width direction so that a roller whose length is short may be retained and to enable the height of the cage to be further reduced when retaining a roller having the same roller diameter.
- a cage for a roller bearing according to the present invention is a cage for a roller bearing in which both pillar portions which face each other in a circumferential direction of a pocket have a plurality of bent portions which are alternately bent in a width direction of the cage to sandwich a roller PCD in the thickness direction of the cage, and each bent portion is provided with roller stopping portions protruding into the pocket.
- Tip portions of the bent portions in the thickness direction of the cage are formed in a cross-sectional shape that becomes narrower toward the tips, and the tip portions are drawn in a state where they protrude into the pocket by plastic deformation processing, thereby forming the roller stopping portions.
- the bent portions have a curved cross-sectional shape. If the bent portions have a curved cross-sectional shape, the tip portions thereof also have a curved shape. In this case, even if the whole bent portions do not necessarily have a curved cross-sectional shape, only at least the tip portions thereof may have a curved cross-sectional shape.
- regions of the tip portions to be elastically deformed are less than the plate thickness of a raw material for the cage.
- the tip portions of the bent portions in the thickness direction of the cage may have arbitrary cross-sections if only they have a cross-sectional shape that becomes narrower towards the tips.
- a cross-sectional shape there are, for example, an arcuate cross-sectional shape, an elliptical cross-sectional shape, etc.
- the tip portions may also include a triangular cross-sectional shape, not limited to the aforementioned cross-sectional shape.
- the tip portions of the bent portions in which the roller stopping portions are to be formed are formed in a shape that becomes narrower toward the tips.
- the length of the roller stopping portions in the width direction of the cage can be shortened that much.
- the regions of the bent portions in the width direction of the cage, which are required for formation of the roller stopping portion can also be made narrow and small.
- the length of the cage in the width direction can be shortened, thereby bringing the roller stopping portions in the width direction of the cage closer to each other. Consequently, it is possible to effectively retain a roller (short roller) whose length is shorter, which cannot be achieved in the related art.
- the roller stopping portions are provided in the tip portions of the bent portions.
- the height of the cage can be reduced as compared with a conventional cage where the roller stopping portions are provided in the whole bent portions.
- the interval of the roller stopping portions and the plate thickness thereof are defined as “D” and “T”, respectively, and when the thickness of the roller stopping portions are made small at foremost ends of the bent portions, it becomes possible to make the thickness of the cage D ⁇ 2T.
- the plate thickness of a raw material for the cage can be reduced to less than 2T beyond the limits of a reduction in the thickness of the conventional cage.
- the cage for a roller bearing of the present invention it is possible to retain a roller which is shorter than a conventional one. Further, it is possible to obtain a cage which is made smaller than a conventional cage while a roller stopping function is ensured to the same degree as a conventional one.
- FIG. 1 is a plan view of a cage for a thrust roller bearing according to an embodiment of the invention.
- FIG. 2 is a partially enlarged perspective view of the cage of FIG. 1 .
- FIG. 3 is a partially enlarged developed plan view of the cage of FIG. 1 .
- FIG. 4 is a sectional view taken along an A-A line of FIG. 3 .
- FIG. 5 is a view illustrating a blanking process in a manufacturing method of the cage of FIG. 1 .
- FIG. 6 is a view illustrating a bent portion forming process in the manufacturing method of the cage of FIG. 1 .
- FIG. 7 is a view illustrating a pocket forming process in the manufacturing method of the cage of FIG. 1 .
- FIG. 8 is a view illustrating a roller stopping portion forming process in the manufacturing method of the cage of FIG. 1 .
- FIG. 9 is a view showing each configuration of a roller stopping portion in the cage of FIG. 1 .
- FIG. 10 is a view another modified example of the roller stopping portion forming process in the cage of FIG. 8 .
- FIG. 11 is a plan view a cage for a radial roller bearing according to another embodiment of the invention.
- FIG. 12 is a sectional view of a conventional cage.
- cage for a roller bearing
- FIGS. 1 to 9 relates to a cage for a thrust roller bearing according to an embodiment of the invention.
- FIG. 1 is a plan view of the cage
- FIG. 2 is a partially enlarged perspective view of the cage of FIG. 1
- FIG. 3 is a partially enlarged developed plan view of the cage of FIG. 1
- FIG. 4 is a sectional view taken along an A-A line of FIG. 3 .
- FIGS. 5 to 8 are views illustrating a manufacturing method of the cage according to the embodiment.
- FIG. 9 is a view showing each configuration of a roller stopping portion in the cage according to the embodiment.
- the cage 10 is a press-formed cage for a thrust roller bearing, so called press cage.
- the cage 10 includes concentric annular ribs 11 radially inside and outside. Both the annular ribs 11 face each other with a gap in the width direction of the cage (in the radial direction).
- a plurality of pillar portions 12 has opposite ends connected integrally with both the annular ribs 11 , respectively, and are arrayed at regular intervals in a circumferential direction and radially from the center of the cage.
- a pocket 13 is formed in the shape of a rectangular window in the width direction of the cage by a space (hole portion) surrounded by the annular ribs 11 and two pillar portions 12 which face each other in the circumferential direction. Rollers 14 are respectively inserted into and retained by the pockets 13 in such a manner that the length direction of the roller extends in the longitudinal direction of the pocket.
- opposite sides of the pocket 13 which face each other in the radial direction are composed of internal surfaces of the two annular ribs 11 which face each other in the width direction of the cage and, opposite sides of the pocket 13 which face each other in the circumferential direction are composed of internal surfaces of the two pillar portions 12 which face each other in the circumferential direction.
- the pillar portions 12 which face each other in the circumferential direction of the pocket 13 have a plurality of bent portions 15 a , 15 b and 15 c which are alternately bent in the width direction of the cage to sandwich the roller PCD (diameter of a circle line CL connecting centers of the roller 14 ) in the thickness direction of the cage.
- the bent portions 15 a , 15 b and 15 c are provided with roller stopping portions 16 a , 16 b and 16 c which protrude into the pocket 13 .
- a middle bent portion 15 a of the pillar portion and opposite bent portions 15 b and 15 c of the pillar portion on opposite sides of the middle bent portion in the width direction of the cage are joined together with inclined sections 17 a and 17 b of the pillar portion, which are inclined with respect to the width direction of the cage.
- the internal surfaces of the pocket 13 have a W-shaped cross section.
- the bent portions 15 a , 15 b and 15 c have a curved cross-sectional shape.
- Tip portions (imaginary line portions indicated by reference numerals 15 a ′, 15 b ′ and 15 c ′ in enlarged view portions of FIG. 9A surrounded by circles X, Y, and Z) of the bent portions in the thickness (height) direction of the cage are formed in a cross-sectional shape that becomes narrower toward the tips by the above curved cross-sectional shape of the bent portions 15 a , 15 b and 15 c . Further, the tip portions are drawn in a state where they protrude into the pocket 13 by plastic deformation working to form the roller stopping portions 16 a , 16 b and 16 c .
- the roller stopping portion 16 a in the middle of the pillar portion retains a half of the roller 14 in one thickness (height) direction of the cage with respect to the roller PCD, and prevents dropping of the roller in the one thickness (height) direction of the cage.
- the roller stopping portions 16 a , 16 b and 16 c at the ends of the pillar portion retains the other half of the roller 14 in the other thickness (height) direction of the cage with respect to the roller PCD, and prevents dropping of the roller in the other thickness (height) direction of the cage.
- FIG. 5A is a partial perspective view of an annular black in a blanking process
- FIG. 5B is a sectional view taken along a line B-B of FIG. 5A
- FIG. 6A is a partial perspective view of an annular blank in a bent portion forming process
- FIG. 5B is a sectional view taken along a line C-C of FIG. 6A
- FIG. 7A is a view of an annular blank in a pocket forming process
- FIG. 7B is a sectional view taken along a line D-D of FIG. 7A
- FIG. 8A is a view of an annular blank in a roller stopping portion forming process
- FIG. 8B is a sectional view taken along a line E-E of FIG. 8A .
- the manufacturing method includes a blanking process, a bent portion forming process, a pocket forming process, and a roller stopping portion forming process.
- annular blank 20 is obtained by blanking a steel plate material (not shown), such as SPCC or SCM415 by the blanking process.
- the annular blank 20 is formed in a bent shape having the plurality of bent portions 15 a , 15 b and 15 c in the width direction of the blank by the bent portion forming process.
- These bent portions 15 a , 15 b and 15 c have the curved cross-sectional shape that becomes narrower toward the tips in the thickness direction of the blank.
- the cross section of the annular blank 20 is formed in the shape of “W” by the bent portion forming process.
- a plurality of pockets 13 are formed in the circumferential direction by punching the annular blank 20 in the pocket forming process.
- tip portions of the bent portions 15 a , 15 b , and 15 c in the thickness direction of the blank are drawn by deformation processing toward the pocket 13 in the vicinity of the pocket 13 using an upper forming mold (pressing punch) 21 and a lower forming mold (die) 22 , thereby forming the roller stopping portions 16 a , 16 b and 16 c .
- a bottom surface of the upper forming mold 21 has a flat part 21 a for forming the roller stopping portions 16 a , 16 b and 16 c in the annular blank 20 .
- the lower forming mold 22 has two convex forming mold surfaces 22 a and 22 b running along inner bottom surfaces of the annular blank 20 , and convex flat parts 22 c and 22 d provided in the inner bottom surfaces, respectively.
- the shape of the flat part 21 a or convex flat parts 22 c and 22 d can be set corresponding to a required protruding amount of the roller stopping portions 16 a , 16 b and 16 c toward the pocket 13 .
- the annular blank 20 is disposed on the lower forming mold 22 , and the tip portions 15 a ′, 15 b ′ and 15 c ′ (refer to FIG. 9A ) of the bent portions 15 a , 15 b and 15 c of the blank 20 are pressed by the convex flat parts 22 c and 22 d of the inner bottom surfaces of the convex forming mold surfaces 22 a and 22 b of the lower forming mold 22 , and the flat part 21 a of the upper forming mold 21 , thereby forming the roller stopping portions 16 a , 16 b and 16 c.
- roller stopping portions 16 a , 16 b and 16 c are simultaneously formed in the above embodiment, the roller stopping portion 16 a and the roller stopping portions 16 b and 16 c may be formed in separate processes such that the convex flat parts 22 c and 22 d are not provided in the lower forming mold, but the roller stopping portions are formed only in the upper forming mold (punch) 21 .
- the two pillar portions 12 of the pocket 13 which face each other in the circumferential direction have the plurality of bent portion 15 a , 15 b , and 15 c which are alternately bent in the width direction of the cage to sandwich the roller PCD in the thickness direction of the cage.
- the tip portions 15 a ′, 15 b ′, and 15 c ′ of the bent portions 15 a , 15 b , and 15 c in the thickness direction of the cage have a curved cross-sectional shape before the pocket forming process.
- the tip portions 15 a ′, 15 b ′ and 15 c ′ are drawn in a state where they protrude into the pockets 13 by plastic deformation processing, thereby forming the roller stopping portions 16 a , 16 b and 16 c.
- FIG. 9 shows a cage capable of retaining a short roller in the cage 10 according to the embodiment
- FIG. 9B shows a cage whose thickness is made small in the cage 10 according to the embodiment.
- the tip portions 15 a ′, 15 b ′ and 15 c ′ are formed in a curved cross-sectional shape that becomes narrower toward the tips.
- flat parts which are long in the width direction of the cage do not need to be provided in the bent portions 15 a , 15 b and 15 c in forming the roller stopping portions 16 a , 16 b and 16 c .
- the width of the cage is shortened whereby the interval of the roller stopping portions 16 a , 16 b and 16 c can be made significantly shorter than a conventional cage.
- a roller whose length is short (short roller) can be retained.
- the tip portions 15 a ′, 15 b ′ and 15 c ′ are drawn in a state where they protrude into the pocket 13 by plastic deformation processing, thereby forming the roller stopping portions 16 a , 16 b and 16 c .
- the thickness of the roller stopping portions 16 a , 16 b and 16 c can be made less than the thickness of the bent portions 15 a , 15 b and 15 c .
- the thickness (height) of the cage which retains the roller 14 having the same roller diameter can be reduced.
- the thickness of the cage becomes approximately D+ ⁇ (where a (the thickness of the roller stopping portions) ⁇ plate thickness T).
- the interval D can be set to the thickness of the cage close to 2T at minimum according to the thickness of the roller. Consequently, the cage can be made smaller than the conventional cage beyond the limits of a reduction in the thickness of the conventional cage (the height of the cage).
- FIGS. 10A and 10B show other another modified example of the roller stopping portion forming process of FIGS. 8A and 8B .
- FIG. 10B is a sectional view taken along a line F-F of FIG. 10A .
- an inner circumferential surface 21 a of the upper forming mold 21 is provided with a convex flat part 21 b .
- the tip portion 15 a ′ of the bent portion 15 a of the annular blank 20 is pressed and is drawn into the pocket 13 , thereby forming the stopper 16 a .
- the lower forming mold 22 is not provided with flat parts, but may be formed into a curved surface (curved-section shape). In this state, a workpiece is turned over after the roller stopping portion 16 a is formed, and the roller stopping portions 16 and 16 c are again provided in the opposite bent portions 15 b and 15 c by the upper forming mold in separate processes.
- FIG. 11 is an enlarged view of a portion in the vicinity of a pocket of a radial type cage 10 according to another embodiment of the present invention.
- the two pillar portions 12 which face each other in the circumferential direction of the pocket 13 has a plurality of bent portions 15 a , 15 b and 15 c which are alternately bent in the width direction of the cage to sandwich the roller PCD in the thickness direction of the cage.
- the bent portions 15 a , 15 b and 15 c are respectively provided with the stoppers 16 a , 16 b and 16 c protruding into the pocket 13 .
- the tip portions of the bent portions 15 a , 15 b and 15 c in the thickness direction (radial direction) of the cage are formed in a shape that becomes narrower toward the tips, and the tip portions are drawn in a state where they protrude into the pocket by plastic deformation processing to form the roller stopping portions 16 a , 16 b and 16 c.
- the tip portions of the bent portions 15 a , 15 b and 15 c formed with the roller stopping portions 16 a , 16 b and 16 c are formed in a shape that becomes narrower toward the tips.
- the width of the cage be reduced, and a roller whose length is short (short roller) can be retained.
- the tip portions are drawn in a state where they protrude into the pocket 13 by plastic deformation processing, thereby forming the roller stopping portions 16 a , 16 b and 16 c .
- the height of the cage can be made lower than that of the conventional cage.
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- General Engineering & Computer Science (AREA)
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- Rolling Contact Bearings (AREA)
Abstract
Description
- The present invention relates to a cage for a needle roller bearing and a cylindrical roller bearing, and a manufacturing method thereof.
- Referring to
FIG. 12 , aconventional cage 100 for a roller bearing will be described.FIG. 12 shows the cross-sectional shape of one of bothpillar portions 101 which face each other in a circumferential direction in apocket 101. The shape of the other pillar portion is also the same. Eachpillar portion 101 has a plurality ofbent portions 102 to 104 which are alternately bent in the width direction of the cage to hold the diameter (the diameter of a pitch circle of the roller, hereinafter referred to as “roller PCD”) of a circle line connecting centers of the roller in the thickness direction of the cage. Thebent portions 102 to 104 are respectively provided withroller stopping portions 105 to 107 protruding in the shape of a claw or a tongue piece into thepocket 101. Aroller 108 is retained within thepocket 101 by theroller stopping portions 105 to 107 (refer to Patent Literatures 1 and 2). - According to the configuration of the
conventional cage 100 as described above, in the manufacturing processes of the cage, there is a pocket forming process of punching an annular blank made of a steel plate which is alternately bent in the shape of “W” in cross section in the width direction, thereby formingpockets 101. In this process, theroller stopping portions 105 to 107 are simultaneously formed such that portions of thebent portions 102 to 104 protrude toward thepocket 101. Thus, flat regions which are relatively long in the width direction of the cage are required in thebent portions 102 to 104 for formation of theroller stopping portions 105 to 107. For this reason, the interval of thebent portions 102 to 104 in the width direction of the cage becomes long. As a result, there is a limit to shortening the interval of theroller stopping portions 105 to 107 in the width direction of the cage. It is thus difficult to shorten the width of the pocket in the width direction of the cage beyond the limit and to manufacture a cage capable of retaining a roller (short roller) whose length is short. Further, assuming that the interval of theroller stopping portions 105 to 107 and the plate thickness thereof are represented by “D” and “T”, respectively, in the configuration of the conventional cage, the cage thickness (height) of 2T+D is necessary. As a result, even if the interval D can be shortened in response to the diameter of a roller, the thickness of the cage cannot be reduced to less than 2T. Thus, this 2T becomes a limit to miniaturization of the cage in the thickness direction. Consequently, it is difficult to miniaturize the cage beyond the above limit. - Patent Document 1: JP-UM-A-64-55322
- Patent Document 2: JP-UM-A-03-51225
- Problems to be Solved by the Invention
- Accordingly, the object to be achieved by the present invention is to enable a cage to be further shortened in a width direction so that a roller whose length is short may be retained and to enable the height of the cage to be further reduced when retaining a roller having the same roller diameter.
- Means for Solving the Problems
- A cage for a roller bearing according to the present invention is a cage for a roller bearing in which both pillar portions which face each other in a circumferential direction of a pocket have a plurality of bent portions which are alternately bent in a width direction of the cage to sandwich a roller PCD in the thickness direction of the cage, and each bent portion is provided with roller stopping portions protruding into the pocket. Tip portions of the bent portions in the thickness direction of the cage are formed in a cross-sectional shape that becomes narrower toward the tips, and the tip portions are drawn in a state where they protrude into the pocket by plastic deformation processing, thereby forming the roller stopping portions.
- Preferably, the bent portions have a curved cross-sectional shape. If the bent portions have a curved cross-sectional shape, the tip portions thereof also have a curved shape. In this case, even if the whole bent portions do not necessarily have a curved cross-sectional shape, only at least the tip portions thereof may have a curved cross-sectional shape.
- Preferably, regions of the tip portions to be elastically deformed are less than the plate thickness of a raw material for the cage.
- The tip portions of the bent portions in the thickness direction of the cage may have arbitrary cross-sections if only they have a cross-sectional shape that becomes narrower towards the tips. As such a cross-sectional shape, there are, for example, an arcuate cross-sectional shape, an elliptical cross-sectional shape, etc. However, the tip portions may also include a triangular cross-sectional shape, not limited to the aforementioned cross-sectional shape.
- In the cage of the present invention, the tip portions of the bent portions in which the roller stopping portions are to be formed are formed in a shape that becomes narrower toward the tips. Thus, if the roller stopping portions are formed in regions closer to the tip portions, the length of the roller stopping portions in the width direction of the cage can be shortened that much. Thereby, the regions of the bent portions in the width direction of the cage, which are required for formation of the roller stopping portion, can also be made narrow and small. As a result, in the cage of the present invention, the length of the cage in the width direction can be shortened, thereby bringing the roller stopping portions in the width direction of the cage closer to each other. Consequently, it is possible to effectively retain a roller (short roller) whose length is shorter, which cannot be achieved in the related art.
- Further, in the cage of the present invention, the roller stopping portions are provided in the tip portions of the bent portions. Thus, even if the facing distance of the roller stopping portions in the thickness direction of the cage is the same, the height of the cage can be reduced as compared with a conventional cage where the roller stopping portions are provided in the whole bent portions. More specifically, in the cage of the present invention, when the interval of the roller stopping portions and the plate thickness thereof are defined as “D” and “T”, respectively, and when the thickness of the roller stopping portions are made small at foremost ends of the bent portions, it becomes possible to make the thickness of the cage D≅2T. As a result, the plate thickness of a raw material for the cage can be reduced to less than 2T beyond the limits of a reduction in the thickness of the conventional cage.
- Moreover, in the present invention, only the tip portions of the bent portions are drawn in a state where they protrude into the pocket by plastic deformation processing. Thus, the regions of the roller stopping portions to be formed become small, whereby the processing force required for the deformation of the roller stopping portions becomes small. Consequently, it is possible to avoid degradation of precision when the roller stopping portions are formed.
- Effects of the Invention
- According to the cage for a roller bearing of the present invention, it is possible to retain a roller which is shorter than a conventional one. Further, it is possible to obtain a cage which is made smaller than a conventional cage while a roller stopping function is ensured to the same degree as a conventional one.
-
FIG. 1 is a plan view of a cage for a thrust roller bearing according to an embodiment of the invention. -
FIG. 2 is a partially enlarged perspective view of the cage ofFIG. 1 . -
FIG. 3 is a partially enlarged developed plan view of the cage ofFIG. 1 . -
FIG. 4 is a sectional view taken along an A-A line ofFIG. 3 . -
FIG. 5 is a view illustrating a blanking process in a manufacturing method of the cage ofFIG. 1 . -
FIG. 6 is a view illustrating a bent portion forming process in the manufacturing method of the cage ofFIG. 1 . -
FIG. 7 is a view illustrating a pocket forming process in the manufacturing method of the cage ofFIG. 1 . -
FIG. 8 is a view illustrating a roller stopping portion forming process in the manufacturing method of the cage ofFIG. 1 . -
FIG. 9 is a view showing each configuration of a roller stopping portion in the cage ofFIG. 1 . -
FIG. 10 is a view another modified example of the roller stopping portion forming process in the cage ofFIG. 8 . -
FIG. 11 is a plan view a cage for a radial roller bearing according to another embodiment of the invention. -
FIG. 12 is a sectional view of a conventional cage. - Hereinafter, a cage for a roller bearing (hereinafter referred to as cage) according to an embodiment of the invention will be described in detail with reference to the accompanying drawings.
- FIGS. 1 to 9 relates to a cage for a thrust roller bearing according to an embodiment of the invention.
FIG. 1 is a plan view of the cage,FIG. 2 is a partially enlarged perspective view of the cage ofFIG. 1 ,FIG. 3 is a partially enlarged developed plan view of the cage ofFIG. 1 , andFIG. 4 is a sectional view taken along an A-A line ofFIG. 3 . FIGS. 5 to 8 are views illustrating a manufacturing method of the cage according to the embodiment.FIG. 9 is a view showing each configuration of a roller stopping portion in the cage according to the embodiment. - The
cage 10 according to the embodiment is a press-formed cage for a thrust roller bearing, so called press cage. Thecage 10 includes concentricannular ribs 11 radially inside and outside. Both theannular ribs 11 face each other with a gap in the width direction of the cage (in the radial direction). A plurality ofpillar portions 12 has opposite ends connected integrally with both theannular ribs 11, respectively, and are arrayed at regular intervals in a circumferential direction and radially from the center of the cage. Apocket 13 is formed in the shape of a rectangular window in the width direction of the cage by a space (hole portion) surrounded by theannular ribs 11 and twopillar portions 12 which face each other in the circumferential direction.Rollers 14 are respectively inserted into and retained by thepockets 13 in such a manner that the length direction of the roller extends in the longitudinal direction of the pocket. - In the aforementioned configuration, opposite sides of the
pocket 13 which face each other in the radial direction are composed of internal surfaces of the twoannular ribs 11 which face each other in the width direction of the cage and, opposite sides of thepocket 13 which face each other in the circumferential direction are composed of internal surfaces of the twopillar portions 12 which face each other in the circumferential direction. - The
pillar portions 12 which face each other in the circumferential direction of thepocket 13 have a plurality ofbent portions bent portions roller stopping portions pocket 13. - A middle
bent portion 15 a of the pillar portion and oppositebent portions inclined sections pocket 13 have a W-shaped cross section. - In the aforementioned configuration, the
bent portions reference numerals 15 a′, 15 b′ and 15 c′ in enlarged view portions ofFIG. 9A surrounded by circles X, Y, and Z) of the bent portions in the thickness (height) direction of the cage are formed in a cross-sectional shape that becomes narrower toward the tips by the above curved cross-sectional shape of thebent portions pocket 13 by plastic deformation working to form theroller stopping portions roller stopping portions roller stopping portion 16 a in the middle of the pillar portion retains a half of theroller 14 in one thickness (height) direction of the cage with respect to the roller PCD, and prevents dropping of the roller in the one thickness (height) direction of the cage. Similarly, in theroller stopping portions roller stopping portions roller 14 in the other thickness (height) direction of the cage with respect to the roller PCD, and prevents dropping of the roller in the other thickness (height) direction of the cage. - The manufacturing method of the
cage 10 according to the embodiment will be described with reference to FIGS. 5 to 8.FIG. 5A is a partial perspective view of an annular black in a blanking process,FIG. 5B is a sectional view taken along a line B-B ofFIG. 5A ,FIG. 6A is a partial perspective view of an annular blank in a bent portion forming process,FIG. 5B is a sectional view taken along a line C-C ofFIG. 6A ,FIG. 7A is a view of an annular blank in a pocket forming process,FIG. 7B is a sectional view taken along a line D-D ofFIG. 7A ,FIG. 8A is a view of an annular blank in a roller stopping portion forming process, andFIG. 8B is a sectional view taken along a line E-E ofFIG. 8A . - The manufacturing method includes a blanking process, a bent portion forming process, a pocket forming process, and a roller stopping portion forming process.
- First, as shown in
FIGS. 5A and 5B , an annular blank 20 is obtained by blanking a steel plate material (not shown), such as SPCC or SCM415 by the blanking process. - Next, as shown in
FIGS. 6A and 6B , the annular blank 20 is formed in a bent shape having the plurality ofbent portions bent portions - Next, as shown in
FIGS. 7A and 7B , a plurality ofpockets 13 are formed in the circumferential direction by punching the annular blank 20 in the pocket forming process. - Finally, as shown in
FIGS. 8A and 8B , in the roller stopping portion forming process, tip portions of thebent portions pocket 13 in the vicinity of thepocket 13 using an upper forming mold (pressing punch) 21 and a lower forming mold (die) 22, thereby forming theroller stopping portions mold 21 has aflat part 21 a for forming theroller stopping portions mold 22 has two convex formingmold surfaces flat parts flat part 21 a or convexflat parts roller stopping portions pocket 13. - The annular blank 20 is disposed on the lower forming
mold 22, and thetip portions 15 a′, 15 b′ and 15 c′ (refer toFIG. 9A ) of thebent portions flat parts mold surfaces mold 22, and theflat part 21 a of the upper formingmold 21, thereby forming theroller stopping portions - Although the
roller stopping portions roller stopping portion 16 a and theroller stopping portions flat parts - In addition, although there are various manufacturing processes, such as cleaning, carburizing and quenching, tempering, polishing, and surface treatment after the roller stopping portion forming process, the description thereof are omitted herein.
- In the
cage 10 according to the embodiment manufactured by the manufacturing method described above, the twopillar portions 12 of thepocket 13 which face each other in the circumferential direction have the plurality ofbent portion tip portions 15 a′, 15 b′, and 15 c′ of thebent portions tip portions 15 a′, 15 b′ and 15 c′ are drawn in a state where they protrude into thepockets 13 by plastic deformation processing, thereby forming theroller stopping portions - Next, referring to
FIG. 9 , thecage 10 according to the embodiment will be described in comparison with theconventional cage 100 shown inFIG. 12 .FIG. 9A shows a cage capable of retaining a short roller in thecage 10 according to the embodiment, andFIG. 9B shows a cage whose thickness is made small in thecage 10 according to the embodiment. - As shown in
FIG. 9A , in thecage 10 according to the embodiment, thetip portions 15 a′, 15 b′ and 15 c′ (portions indicated by imaginary lines within the extracted enlarged circles X, Y, and X) formed with theroller stopping portions bent portions roller stopping portions cage 10 according to the embodiment, the width of the cage is shortened whereby the interval of theroller stopping portions - As shown in
FIG. 9B , in thecage 10 according to the embodiment, thetip portions 15 a′, 15 b′ and 15 c′ are drawn in a state where they protrude into thepocket 13 by plastic deformation processing, thereby forming theroller stopping portions roller stopping portions bent portions conventional cage 100 in which the thickness of theroller stopping portions bent portions roller 14 having the same roller diameter can be reduced. - That is, assuming the interval of the
roller stopping portions cage 10 according to the embodiment, the thickness of the cage becomes approximately D+α (where a (the thickness of the roller stopping portions) << plate thickness T). As a result, the interval D can be set to the thickness of the cage close to 2T at minimum according to the thickness of the roller. Consequently, the cage can be made smaller than the conventional cage beyond the limits of a reduction in the thickness of the conventional cage (the height of the cage). - (Other Embodiments)
- (1)
FIGS. 10A and 10B show other another modified example of the roller stopping portion forming process ofFIGS. 8A and 8B .FIG. 10B is a sectional view taken along a line F-F ofFIG. 10A . In the roller stopping portion forming process shown inFIG. 10 , an innercircumferential surface 21 a of the upper formingmold 21 is provided with a convexflat part 21 b. By the lower formingmold 22 and the upper formingmold 21 shown inFIG. 10 , thetip portion 15 a′ of thebent portion 15 a of the annular blank 20 is pressed and is drawn into thepocket 13, thereby forming thestopper 16 a. In this case, the lower formingmold 22 is not provided with flat parts, but may be formed into a curved surface (curved-section shape). In this state, a workpiece is turned over after theroller stopping portion 16 a is formed, and theroller stopping portions 16 and 16 c are again provided in the oppositebent portions - (2)
FIG. 11 is an enlarged view of a portion in the vicinity of a pocket of aradial type cage 10 according to another embodiment of the present invention. In thecage 10 according to this embodiment, the twopillar portions 12 which face each other in the circumferential direction of thepocket 13 has a plurality ofbent portions bent portions stoppers pocket 13. The tip portions of thebent portions roller stopping portions - In the
cage 10 according to the embodiment shown inFIG. 11 , the tip portions of thebent portions roller stopping portions - In the
cage 10 according to the embodiment shown inFIG. 11 , the tip portions are drawn in a state where they protrude into thepocket 13 by plastic deformation processing, thereby forming theroller stopping portions - In addition, the present invention can be changed in various ways within the scope as set forth in the claims.
Claims (3)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004-327797 | 2004-11-11 | ||
JP2004327797A JP4606128B2 (en) | 2004-11-11 | 2004-11-11 | Method for manufacturing roller bearing cage |
PCT/JP2005/020698 WO2006051893A1 (en) | 2004-11-11 | 2005-11-11 | Retainer for roller bearing and method of manufacturing the same |
Publications (2)
Publication Number | Publication Date |
---|---|
US20070297707A1 true US20070297707A1 (en) | 2007-12-27 |
US7866895B2 US7866895B2 (en) | 2011-01-11 |
Family
ID=36336567
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/666,982 Expired - Fee Related US7866895B2 (en) | 2004-11-11 | 2005-11-11 | Cage for roller bearing and manufacturing method thereof |
Country Status (5)
Country | Link |
---|---|
US (1) | US7866895B2 (en) |
EP (1) | EP1818555B1 (en) |
JP (1) | JP4606128B2 (en) |
KR (1) | KR20070092203A (en) |
WO (1) | WO2006051893A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20090087128A1 (en) * | 2007-09-28 | 2009-04-02 | Jtekt Coporation | Cage, production method for the cage, thrust roller bearing equipped with the cage |
US20150252849A1 (en) * | 2012-10-05 | 2015-09-10 | Ntn Corporation | Needle roller and cage assembly |
CN105658976A (en) * | 2013-10-22 | 2016-06-08 | 舍弗勒技术股份两合公司 | Axial cage for cylindrical rolling bodies |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2009024849A (en) * | 2007-07-23 | 2009-02-05 | Jtekt Corp | Retainer for thrust needle roller bearings |
JP2009024850A (en) * | 2007-07-23 | 2009-02-05 | Jtekt Corp | Method for manufacturing retainer for thrust needle roller bearings |
DE102008004033B4 (en) * | 2008-01-11 | 2012-05-31 | Schaeffler Technologies Gmbh & Co. Kg | Cage for rolling elements |
US8602657B2 (en) * | 2009-06-15 | 2013-12-10 | Koyo Bearings Usa Llc | Cage for bearing assembly |
DE102012215740A1 (en) * | 2012-09-05 | 2014-03-06 | Schaeffler Technologies AG & Co. KG | Axial cage for cylindrical rolling elements |
US10941811B1 (en) * | 2020-01-14 | 2021-03-09 | Schaeffler Technologies AG & Co. KG | High-speed bearing |
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US3240542A (en) * | 1962-02-20 | 1966-03-15 | Schaeffler Ohg Industriewerk | Roller thrust bearing |
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- 2004-11-11 JP JP2004327797A patent/JP4606128B2/en not_active Expired - Fee Related
-
2005
- 2005-11-11 EP EP05805922.1A patent/EP1818555B1/en not_active Not-in-force
- 2005-11-11 WO PCT/JP2005/020698 patent/WO2006051893A1/en active Application Filing
- 2005-11-11 KR KR1020077010169A patent/KR20070092203A/en not_active Application Discontinuation
- 2005-11-11 US US11/666,982 patent/US7866895B2/en not_active Expired - Fee Related
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US2805108A (en) * | 1949-02-07 | 1957-09-03 | Skf Ind Inc | Roller cages for roller bearings |
US3240542A (en) * | 1962-02-20 | 1966-03-15 | Schaeffler Ohg Industriewerk | Roller thrust bearing |
US3240543A (en) * | 1964-07-01 | 1966-03-15 | Torrington Co | Thrust bearing |
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Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20090087128A1 (en) * | 2007-09-28 | 2009-04-02 | Jtekt Coporation | Cage, production method for the cage, thrust roller bearing equipped with the cage |
US8113719B2 (en) | 2007-09-28 | 2012-02-14 | Jtekt Corporation | Cage and thrust roller bearing equipped with the cage |
US20150252849A1 (en) * | 2012-10-05 | 2015-09-10 | Ntn Corporation | Needle roller and cage assembly |
US9618041B2 (en) * | 2012-10-05 | 2017-04-11 | Ntn Corporation | Needle roller and cage assembly |
CN105658976A (en) * | 2013-10-22 | 2016-06-08 | 舍弗勒技术股份两合公司 | Axial cage for cylindrical rolling bodies |
Also Published As
Publication number | Publication date |
---|---|
EP1818555A1 (en) | 2007-08-15 |
JP2006138372A (en) | 2006-06-01 |
KR20070092203A (en) | 2007-09-12 |
JP4606128B2 (en) | 2011-01-05 |
WO2006051893A1 (en) | 2006-05-18 |
US7866895B2 (en) | 2011-01-11 |
EP1818555B1 (en) | 2013-06-05 |
EP1818555A4 (en) | 2011-05-04 |
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Owner name: JTEKT CORPORATION, JAPAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:HAYASHI, ATSUNORI;ATSUMI, TOSHIYUKI;REEL/FRAME:019288/0012;SIGNING DATES FROM 20070110 TO 20070118 Owner name: JTEKT CORPORATION, JAPAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:HAYASHI, ATSUNORI;ATSUMI, TOSHIYUKI;SIGNING DATES FROM 20070110 TO 20070118;REEL/FRAME:019288/0012 |
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Effective date: 20150111 |